clintropolis opened a new pull request, #17561:
URL: https://github.com/apache/druid/pull/17561

   
   ### Description
   changes:
   * introduces FilteredInputBinding which adds better conditional expression 
processing support using a VectorMatch internally to selectively evaluate input 
vectors instead of precomputing all inputs, with nvl updated to take advantage 
of this
   * refactor some stuff to streamline expression vector processor 
implementation for simple functions like most math and logical operations with 
some new factory classes
   * update vector identifier expression processor to delegate evaluating 
results directly to the input binding selectors with ExprEvalBindingVector
   * add maxVectorSize() to ExprVectorProcessor to avoid having to pass max 
vector size around everywhere
   


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